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D( a )
a-2 = 0
a-2 = 0
a-2 = 0
a-2 = 0 // + 2
a = 2
a in (-oo:2) U (2:+oo)
(a^2+5*a-19)/(a-2) = 0
a^2+5*a-19 = 0
a^2+5*a-19 = 0
DELTA = 5^2-(-19*1*4)
DELTA = 101
DELTA > 0
a = (101^(1/2)-5)/(1*2) or a = (-101^(1/2)-5)/(1*2)
a = (101^(1/2)-5)/2 or a = (-(101^(1/2)+5))/2
(a+(101^(1/2)+5)/2)*(a-((101^(1/2)-5)/2)) = 0
((a+(101^(1/2)+5)/2)*(a-((101^(1/2)-5)/2)))/(a-2) = 0
( a+(101^(1/2)+5)/2 )
a+(101^(1/2)+5)/2 = 0 // - (101^(1/2)+5)/2
a = -((101^(1/2)+5)/2)
( a-((101^(1/2)-5)/2) )
a-((101^(1/2)-5)/2) = 0 // + (101^(1/2)-5)/2
a = (101^(1/2)-5)/2
a in { -((101^(1/2)+5)/2), (101^(1/2)-5)/2 }
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